Become one with the track. The GraviTrax Power Expansion Interaction includes various electronic components for the Ravensburger marble run. One track, countless possibilities. With the electronic GraviTrax Power elements, players can vary the path of the marbles. At the desired moment, the Power elements Switch, Starter, or Lever are activated via the controller. For this, players switch between three color channels and activate the stones programmed for the colors red, green, or blue. By skillfully integrating, combining, and programming, new track layouts are constantly created - ensuring long-lasting fun.